Pump



E. T. KIEN.

Dec. 19, 1922.

PUMP.

FILED JUNE 7, 1921.

2 SHEETSSHEE] 1.

FROM can.

Dec. 19, 1922. 1,439,628. E. T. KIEN.

PUMP.

FILED JUNE 7, 1921. 2 SHEETSSHEET g.

31-14mm for Edward Kien Patented ec. 19, 1 922.

STATES PATIENT OFFICE.

EDWARD THOMAS KIEN, 0F ELMHUBST, ILLINOIS, ASSIGNOR or ONE-HALF TOEMMETT s. NEWTON AND w. M. HARDWICK, 130m 0F CHATTANOOGA,

TENNESSEE.

PUMP.

Application filed June 7, 1921. Serial No. 475,668.

citizen of the United States, residing at Elmhurst, in the county of DuPage and State of Illinois, have invented certain new and usefulImprovements in Pumps, of which the following is a specification.

My said invention relates to a pump for oil and gas, of the general typedescribed in my Patent No. 1,355,231, filed October 12, 1920, and myPatent No. 1,409,868, March 14, 1922.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, 7

Figure 1 is an elevation of a refrigerator mechanism in which the pumpmay be used,

Figure 2, an elevationpart ly in section of the pump and associateddevices, and

Figure 3 is a collective viewof the pump casing and associated parts.

In the drawings 10 indicates a motor for driving through a shaft 11 thepump shown in Figure 1 which is enclosed in a casing .12 having an upperhollow portion 13 forming a separating chamber for oil and gas and alsoacting as a storage chamber for compressed gas. The gas forced into thischain ber by the pump passes through a pipe 14 18 back to the pump to beagain condensed.

The casing 12 has a cylindrical chamber 19 with end plates or heads 20and the shaft 11 passes through said end plates and the chamber. A pumpcasing 21 is mounted approximately midway between the end plates 20 andhas at each side a disk22, beyond each of whiclris a second disk 23 'allof which parts are shown in Figure 3. Ball bearings 24 mounted in plates23 provide anti-friction supports for the shaft 11 and the shaft 26 ofthe co-acting rptor of the pump. Bolts pass through aligned openings inthe parts 21, 22 and 23 (see Fig. 3) and in one or both heads 20 andsecure these parts together and in proper relation to said heads.

One of the heads ,20 is provided with a passage 28 by which the gas fromthe pipe 18 passes through openings 29 and 30 to a cut away portion 31of casing 21. At the other end of the rotors and on the opposite sideofa plane passing through their axes is a passage 32 through which thecompressed gas passes to a similar channel in a disk 33 which has anextension 34 engaging the ad- Jacent head 20 and spacing the disktherefrom thus providing room for an upwardly extending part of thechannel 32. A pipe 42 extends upwardly from the disk and carries at itsupper end a baflie-43 which as-' sists in separating the oil from thegas. The oil falls back into the cylindrical chamber surrounding thepump casing and this chamber is normally filled nearly to the top. Theoil in the chamberis kept'cool'by tubes 27 extending longitudinallytherethrough in 5 an annular series spaced about the casing 21 shown inFigure 1 which act by suction opposite the cut-away portion 31 of thecasing to draw gas between them. As the gears revolve the gas isgradually compressed and forced out through the channel 32. The casing21 and disks 22, 23 and 33 are held in proper relation to each other andto the end plates of the chamber by pins indicated at 37. To provide forfeeding oil to the gears to seal the openings between the teeth I haveindicated a vertical groove 38 in the left-hand disk 23, this grooveleading to ports 39 in disk 22. Ports 39 open into a pair of horizontalpassages 40 through the casing -21 and these passages are furthersubdivided, each into four branches 41 extending toward the gearswhereby the oil may be admitted at different points tothat portion ofeach gear having a compression action on the gas.

' The first oil admission opening at the right in Figure 3 admits oil tothe space between the respective gear teeth just prior to initialcompression, oil being forced in due to the pressure in chamber 13 whichgreatly exceeds that on the suction" side of the gears. Compression thenbegins and as the teeth "pass the successive ducts 4:1 addi-- tional oilis admitted the pressure in the chamber being still above that betweenthe gear teeth. The oil so admitted is taken from the top of the chamberwhere it is hottest and least likely to contain an admixture ofliquefied gas such as would inter fere with proper working of the pump.It will be understood that the oil forms a foam between the rapidlyrotating gears and so lubricates them and also acts as a liquid seal toprevent escape ofgas between them. The compressed gaS ejected at 34sometimes falls to the bottom of the chamber with the cold oil in aliquid form and if admitted hetween the gears would thin the oil andtend to break the liquid seal. Admission of'the oil is successive smallincrements \helps to form the foam by breaking up the stream of oil.

Normally the entire body of oil will be hot enough to cause the gas toseparate therefrom immediately, but still be cooled enough by theventilating pipes to prevent overheating of the pump and of the oilitself. The gas is more and more compressed as each tooth passes alongthe groove between two others and is finally forced with the oil outthrough passages 2 and 33. The oil falls back into chamber 9 and thus acontinuous circulation takes place, clean oil being taken from the topof the body of oil and impurities fallin to the bottom of the chamber 19from w ich they may be removed at proper times in any convenient manner.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A pump-comprising a' pair of. rotors having inter-engaging spiralteeth, a casing surrounding said rotors having an inlet passage forgasadjacent one end of said teeth and means providing an outlet passageadjacent the opposite end of said rotors and at the opposite side fromthe inlet,

a pair of discs adjacent the casing, said inlet and outlet passagesextending through the said discs, substantially as set forth.

2. A gas compressor comprising a .housmg open at opposite sides,end-closures therefor, a shaft extending through said end-closures,compressing ,means driven thereby, a casing enclosing the compressingmeans and forming with thehousing a chamber .containing oil said casinghaving passages for oil from the chamber to the compressing means,detachable end-closures on said casing, an inlet passage leading to saidcompresslng means, an outlet through one of the end closures of thehousing said end-closure being spaced from the end of the housing, apipe extending upward in said space to the lpper part of the chambering, a pair of rotors in the housing having combination of a housing, acylindrical cas- 'ing within the housing and spaced from the wallsthereof,-said parts providing between them a chamber containing oil, arotary pump within the casing, inlet and outlet passages to said casingfor admitting gas to the pump to be compressed,means providingcirculation of oil through the pump .in connection with the gas passingtherethrough, a fan at one end of the housing and ventilating pipesextending through the chamber in co-acting relation to said fan,substantially as set forth.

4. A gas compressor comprising a housinter-engaging spiral teeth, acasing surrounding said rotors, a pair of disks engaging the ends ofsaid casing and said rotors, a second pair of disks between the disks ofsaid first pair and the housing, and inlet and exit passages'in saiddisks for permitting circulation of gas to and from the pump,substantially as set forth.

5.-A gas compressor comprising a hous-- ing, a pair of rotors in thehousing having inter-engaging spiral teeth, a casing surrounding saidrotors, a pair of disks engaging the ends of said casing and saidrotors, a second pair of disks between the disks of said first pair andthe housing, inlet and exit passages in-said disks for permitting 10Ccirculation of gas to and from the pump, and inlet passages in saiddisks and in the casing for admitting oil to the pump to form a liquidseal therefor, substantially as set forth. p

6. A pump for air and gas compressors comprising a cylindrical chamber,heads at opposite ends of the chamber, a pair of .rotors within thechamber having inter-engaging spiral teeth, a casing about said 111rotors, discs closing the ends of the casing and confining the rotorstherein, said discs being secured between the rotors and the heads, aninlet passage through such discs for admitting gas to the rotors, anoutlet llfi passage through said discs, means for admitting oil to saidrotors, and a pipe connected to said outlet passage extending upwardfrom the rotors and having at itsupper end a baffle to separate the oilfrom the gas, substantially as set forth. 7. A pump comprising a pair ofrotors having inter-engaging spiral teeth, a casing surrounding saidrotors having an inlet passage for gas adjacent one end of said leadingfrom the upper end of the chamber In Witness whereof, I have hereuntoset and having branches adjacent the rotors, my hand and seal atAtlanta, Georgia this 10;

one branch communicating with the space 27th day of May, A. D., nineteenhundred about the rotors just prior to initial com? and twenty-one'.'

- pression position and the remaining EDWARD THOMAS KIEN; [1 s.] I

branches admitting oil in successive incre- Witnesses: ments duringcompression, substantially as R. W. STARKE set forth. 1

W. W. STEVENS.

